Square puzzle



FIG. 1 is a top plan view of a square puzzle showing my new design;

FIG. 2 is a top plan view of a modified form of the design shown in FIG. 1.

The unshown side of the design and the modified form thereof is substantially a mirror image of the side shown. The claimed design and modified form thereof is substantially flat and thin and two dimensional. 

The ornamental design for a square puzzle, as shown and described. 